Your eye contains a convex lens. Why is it unwise to look at the sun?
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It is unwise to look at the sun because the convex lens focusses a lot of sun rays into our eyes and this may damage them.
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When an object is placed at a distance of 15cm from a concave mirror, its image is formed at 10cm in front of the mirror. Calculate the focal length of the mirror.
An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.